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To redeem this discount, simply book your flights at Spirit.com (round-trip only), and use the promo code 50OFF. The offer is good for travel between January 9 and February 13.
To redeem a $35 discount, use the promo code 35OFF. The travel period is February 14 through March 6.
For a $24 discount, use the code 24OFF. The travel period is April 16 through August 31.
Full details here. These promo codes reduce your base fare only; taxes and fees are applied separately. Flights must be booked before 11:59pm ET on December 17.